Update #19353#21268

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steveklabnik wants to merge 2 commits intorust-lang:masterfrom

steveklabnik:update_19353

Commits on Jan 16, 2015

Added src/doc/grammar.md to hold Rust grammar

icorderi
authored and
steveklabnik
committed
Copied all the grammar productions from reference.md to grammar.md

icorderi
authored and
steveklabnik
committed